CN1244312A - Oscillator - Google Patents

Oscillator Download PDF

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Publication number
CN1244312A
CN1244312A CN98802019A CN98802019A CN1244312A CN 1244312 A CN1244312 A CN 1244312A CN 98802019 A CN98802019 A CN 98802019A CN 98802019 A CN98802019 A CN 98802019A CN 1244312 A CN1244312 A CN 1244312A
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CN
China
Prior art keywords
oscillator
frequency
amplifier
resistance
resonator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN98802019A
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Chinese (zh)
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CN1113451C (en
Inventor
H·G·范维南达尔
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Publication of CN1244312A publication Critical patent/CN1244312A/en
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Publication of CN1113451C publication Critical patent/CN1113451C/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0231—Astable circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H03B5/1212—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
    • H03B5/1215—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/013—Modifications of generator to prevent operation by noise or interference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/003—Circuit elements of oscillators
    • H03B2200/004—Circuit elements of oscillators including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/006—Functional aspects of oscillators
    • H03B2200/0098—Functional aspects of oscillators having a balanced output signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2202/00—Aspects of oscillators relating to reduction of undesired oscillations
    • H03B2202/08—Reduction of undesired oscillations originated from the oscillator in circuit elements external to the oscillator by means associated with the oscillator
    • H03B2202/082—Reduction of undesired oscillations originated from the oscillator in circuit elements external to the oscillator by means associated with the oscillator by avoiding coupling between these circuit elements

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

An oscillator is formed by a resonator(RES)coupled to an amplifier(AMP)via a coupling path(COP). In order to counter unwanted oscillations due to parasitic resonances in the coupling path(COP), the coupling path(COP)includes a series resistance(RS). To improve the noise-performance even more a series capacitance can be included in the coupling path(COP). Such a series capacitance will also effectively widen a frequency range over which the oscillator can be tuned.

Description

Oscillator
The present invention relates to a kind ofly be coupled to the oscillator that amplifier is formed by resonator.This oscillator can be used for, and for example, receiver is to provide the mixing carrier wave of VHF and/or UHF frequency band.
U.S. Pat-A 5,434, and 544 have described a kind of oscillator that has comprised the resonator that is coupled to amplifying stage.This document claims that practical resonator generally has different resonance frequencys, and this is because the element of resonator has undesirable reactance.For example, being used for the lc circuit that the UHF TV tuner is equipped with variable capacitance diode has three resonance frequencys, and one of them is desirable, and other two is parasitic.
For suppressing the vibration under the undesirable frequency, following mode is used in suggestion.Amplifying stage comprises an amplifier transistor, and its output current flows into the emitter of load transistor through the load signal path.This amplifying stage obtains a bandpass characteristics by the passive capacitive bootstrapping signal of the base stage that reaches load transistor by this signal path.Therefore, this oscillator vibrates in the passband of amplifying stage.The frequency of oscillation that is adjusted near hope by the passband with amplifying stage suppresses undesirable vibration.
The oscillator that the purpose of this invention is to provide a kind of the above-mentioned type, it has preferable performance with respect to prior art aspect the noise.Claim 1 and 3 has defined oscillator of the present invention and receiver respectively.The selectable better function of other claims definition the present invention.
The present invention considers the following aspects.In the oscillator of any practicality, stray reactance does not exist only in the resonator self, also is present in the coupling path between resonator and the amplifier.For example, if amplifier is realized that by integrated circuit coupling path will comprise lead frame and the connecting line that forms stray inductance.It also will comprise connecting line and package board, and they form parasitic capacitance.In either case, the stray reactance in the coupling path between resonator and the amplifier will cause spurious resonance.This spurious resonance hereinafter referred to as parasitic couplings path resonance, can surpass the desirable resonance that resonator provides.Further, the frequency of this parasitic couplings path resonance and the resonance of hope are comparatively approaching, and particularly, oscillator is in higher frequency, and for example, in the 1GHz level, during work, and/or oscillator is when tunable.
In background technology, undesirable vibration is that the bandpass characteristics by amplifier suppresses, and this amplifier amplifies required resonance and do not amplify spurious resonance.If the resonance that parasitic couplings path resonance surpass to be wished, particularly, if the resonance of the frequency of parasitic couplings resonance and hope comparatively near the time, the bandpass characteristics needs are steep relatively.For making bandpass characteristics steep, the positive feedback loop of being made up of load transistor and passive capacitive bootstrapping signal transmission device in the amplifier needs a gain, and yield value is approximately near 1.But in this case, the noise that in fact is in the load transistor in the positive feedback loop will be amplified to relatively large degree.As a result, in background technology, resist undesirable vibration and be attended by loss on the noiseproof feature.If sneak path resonance be dominant and, particularly close with the frequency of needed resonance, this loss can especially severe.
According to the present invention, the path between resonator and the amplifier comprises a series resistance.Have been found that this series resistance suppresses the inhibition of the obvious serious offense of degree of sneak path resonance to required resonance.As a result, amplifier no longer needs tangible relatively bandpass characteristics to suppress undesirable vibration.As a result, be arranged in the load transistor that positive feedback loop is used to realize bandpass characteristics if amplifier comprises one, then this loop no longer needs the gain near 1 value.Therefore, compare with background technology, it is very little that the noise in the load transistor will be exaggerated.Series resistance in this path has also suppressed sneak path resonance to a great extent, so that amplifier no longer needs a bandpass characteristics to suppress undesirable vibration.In this case, amplifier no longer needs to be included in the load transistor in the positive feedback loop.The substitute is, can use the less load circuit of noise, for example, single resistance.
Under any circumstance, compare, the invention enables the amplifier in the oscillator that better noise characteristic is arranged with background technology.This will bring benefit for the noise characteristic of oscillator, itself be this shortcoming of noise source with respect to the series resistance in the path, and benefit is still more.Have been found that in many application the benefit of bringing is considerably beyond its shortcoming.Therefore, compare with background technology, the present invention make oscillator aspect noise characteristic by preferably the performance.
It below is another advantage of the present invention.The characteristic of oscillator also depends on the gain of oscillation circuit, and this loop is made up of the amplifier resonator.If the oscillation circuit gain is too little, oscillator may nonoscillatory.If the oscillation circuit gain is too big, the transistor in the amplifier may be saturated, and this will have a negative impact to oscillator signal.In the practical application, if resonator is tunable, the oscillation circuit gain will vary, the result, and characteristic is with instability.Have been found that in many application the series resistance in the path between resonator and the amplifier reduces effectively because the variation of the tuning oscillation circuit gain that brings.As a result, the invention enables oscillator in desirable tuning range, to make the tuning highly stable of oscillator.
The present invention can all or part ofly be realized by integrated circuit.For example, integrated circuit can comprise the amplifier of oscillator, and this amplifier has a positive feedback path.The resonator of oscillator can be connected to this regenerative circuit at the parallel connection outside of integrated circuit.The advantage of this implementation is its saving cost, and this is because the external component that this integrated circuit has less pin and connects resonator and amplifier.Note that in this cost-effective implementation,, will have the potential risk that produces undesirable vibration if do not adopt resonator among the present invention and the series resistance in the path between amplifier.Therefore, the present invention can adopt not only reliable but also save the integrated circuit of cost.
The present invention can be applicable to comprise in the receiver of frequency converter, and the signal transition that this frequency converter is used for receiving is an intermediate frequency.This will need an oscillator, for frequency converter provides frequency converted carrier.Because the present invention can be realized by not only reliable but also integrated circuit that save cost, make that the receiver cost is lower.Further, because the present invention makes oscillator that proper noise character be arranged, make that the quality of reception of receiver is better.Above advantage makes the present invention be particularly suitable for digital receiver, for example, and digital image broadcasting (DVB) receiver.
Below with reference to description of drawings the present invention and other selectable technical characterictics:
Fig. 1 is the block diagram of explanation essential characteristic of the present invention;
Fig. 2 is the block diagram of the additional technical feature of explanation claim 2;
Fig. 3 is the circuit diagram according to oscillator of the present invention; With
Fig. 4 a and 4b are the charts of effect of series resistance of the oscillator of key diagram 3.
At first, reference marker is done some explanations.In institute's drawings attached, parts of the same race use same letter mark sign.Have a plurality of parts of the same race among one width of cloth figure.In this case, distinguish parts of the same race with adding numeral behind the letter.When the number of parts of the same race was operational factor, this numeral was put into bracket.Under the suitable situation, the numeral of some reference symbols in specification and claims will be omitted.
Fig. 1 illustrates the bright essential characteristic of this law with solid line.An oscillator OSC is coupled to an amplifier AMP by a resonator RES by coupling path COP and forms.This coupling path comprises resistance RS in parallel.
Fig. 1 is shown in broken lines below also inciting somebody to action.This oscillator is formed the parts of receiver REC.It provides mixing carrier wave Smix for frequency converter MIX, is medium wave IF with the signal Srf frequency conversion that receives.
Fig. 2 illustrates following supplementary features.Coupling path COP between resonator RES and the amplifier AMP also comprises a series capacitance CS.The feature of Fig. 2 is based on following consideration.The noise characteristic of oscillator depends on the phase-frequency characteristic of the resonator RES that is coupled to amplifier AMP.Phase-frequency characteristic is steep more near needed resonance, and noise characteristic is good more.Series capacitance CS has increased the steepness of phase-frequency characteristic effectively.As a result, series capacitance CS helps further to improve noiseproof feature.
Another advantage of the feature of Fig. 2 is as follows.It is tunable can requiring this oscillator.In the practical application, tunable oscillator is by the resonator realization that has by the electric device of the tuning variable reactance of for example tuning control voltage method.The tuning range of oscillator not only by electric device tuning range decision, also the characteristic by the structure of oscillator and other elements wherein determines.As shown in Figure 2, if add series capacitance CS in the coupling path between resonator RES and amplifier AMP, what tuning range will be when not adding electric capacity is wide.Therefore, the feature of Fig. 2 makes oscillator adjustable in relative broad range.
Fig. 3 illustrates a bright example of this law of the feature that comprises aforesaid Fig. 1 and Fig. 2.In the oscillator among Fig. 3, amplifier AMP forms the part of integrated circuit (IC) and comprises the positive feedback path of an integrated capacitance C1-C4 form.It also comprises three integrated transistor Ti1-Ti3, two integrated resistor Ri1-Ri2 and for integrated transistor Ti1-Ti3 provide bias voltage integrated bias circuit BIAS.Resonator RES is by two coil L1 and L2, two capacitor C 1 and C2, and the variable reactor VAR that resistance R 1 and adjustable voltage Vtun execute thereon forms.Resonator RES is coupled on the node N1 and N2 of amplifier AMP by coupling path COP.
In the oscillator among Fig. 3, coupling path COP comprises pair of series resistance R S1 and RS2, pair of series capacitor C S1 and CS2.It also comprises some parasitic capacitance Cpar and stray inductance Lpar.Parasitic capacitance Cpar1 can be obtained by the electric capacity between two circuits on the printed circuit board (PCB) for example.Parasitic capacitance Cpar2 can connect pin P1 by two of the integrated circuit (IC) of for example forming a coupling path COP part, and the electric capacity between P2 obtains.Stray inductance Lpar1, Lpar2 can be formed by the lead frame of for example integrated circuit (IC) and stray inductance Lpar3, and Lpar4 is formed by connecting line.
The operational mode of the oscillator of Fig. 3 is explained as follows.Resonator RES and coupling path COP form impedance between node N1 and N2.Amplifier AMP also forms impedance between this node.Above-mentioned two impedances all can be considered the parallel connection between resistance and reactance.After satisfying following two conditions, oscillator can vibrate under certain frequency.The necessary polarity of the reactance of the first, two impedance is opposite identical with numerical value.The second, the resistance that resonator RES and coupling path COP form hereinafter referred to as oscillation circuit resistance (tank resistance), must have the value of the absolute value of the resistance that forms greater than amplifier AMP.This oscillation circuit resistance has negative polarity and avoids suppressing resonator RES effectively.Therefore, below will be called non-inhibition resistance.It should be noted that in the oscillator of Fig. 3, the resistance of non-inhibition resistance basically with frequency-independent, this and US-A5, the oscillator difference of describing in 434,544.The oscillator in back has an amplifier, and this amplifier provides the non-inhibition resistance that resistance is relevant with frequency.
In the application of the television set of the oscillator of Fig. 3, series resistance RS1 and RS2 can arrive optimum efficiency in 10 ohm level.For example, the oscillator application of Fig. 3 is in VHF-A, VHF-B and UHF frequency band tuning, and series resistance RS1 and RS2 are respectively 47,27 and 15 ohm.Series capacitance CS1 and CS2 be the picofarad level preferably.Adopt these numerical value, the tuning of UHF frequency band is extended to from maximum near 900MHz, as not using series capacitance, extremely near 1070MHz.Further, because series capacitance CS1 and CS2 have also widened the tuning range in VHF-A and the VHF-B bandwidth effectively, the realization of resonator RES is just no longer most important.That is, the element of resonator RES needn't satisfy the very strict requirement of element distribution so that tuning in whole VHF-A and VHF-B bandwidth.Further, in above-mentioned arbitrary bandwidth, series capacitance CS1 and CS2 have improvement aspect noise.
Fig. 4 a and 4b illustrate series resistance RS1 among the coupling path COP between resonator RES and the amplifier AMP and the effect of RS2.Two width of cloth figure show oscillation circuit resistance (Rtank) between node N1 and N2 as the function of the frequency (F) of the different tuning states of resonator RES.When series resistance RS is null value, promptly there is not series resistance, obtain Fig. 4 a and when series resistance RS is 5 ohm, obtain Fig. 4 b.Among two width of cloth figure, resonance frequency likely is positioned at one of them frequency frequency FRwant and spurious resonance and is positioned at wherein two frequency range FRpar1 and FRpar2.It should be noted that resonator RES designs for the UHF television applications of the oscillator of Fig. 3.
Among Fig. 4 a, the oscillation circuit resistance when the oscillation circuit resistance during parasitic resonance frequency among the frequency range FRpar2 is higher than hope frequency among the frequency range FRwant.In order to satisfy the oscillating condition of the resonance frequency of wishing, the non-inhibition resistance that amplifier AMP forms must have the absolute value less than oscillation circuit resistance.But, in this case, the oscillation circuit resistance the when absolute value of non-inhibition resistance must be less than parasitic resonance frequency.As a result, oscillator OSC has the danger of vibrating under the resonance frequency of parasitic resonance frequency rather than hope.
Among Fig. 4 b, the oscillation circuit resistance the during resonance frequency of the oscillation circuit resistance height overall the during resonance frequency of the hope among the frequency range FRwant in frequency range FRpar1 and FRpar2.Amplifier AMP can make in the following manner, makes the absolute value of non-inhibition resistance less than wishing oscillation circuit resistance under the resonance frequency and oscillation circuit resistance during greater than parasitic resonance frequency.At this moment, only under the frequency of the resonance of hope, just satisfy oscillating condition.But even the oscillation circuit resistance of the absolute value of non-inhibition resistance during less than parasitic resonance frequency, oscillator also will vibrate under the resonance frequency of hope, because oscillation circuit resistance is higher under this frequency.
Accompanying drawing and above explanation are in order to illustrate rather than to limit this law bright.Change in the bright claim scope of a plurality of this laws can be arranged.For this respect, following explanation is arranged.
There are the function of different units and a plurality of physical distribution of functional element.This respect, accompanying drawing are that schematically each only represents the possible embodiment that this law is bright.
Label in the bracket can not be considered as the restriction of claim.

Claims (3)

1. one kind is coupled to the oscillator (OSC) of amplifier (AMP) by a resonator (RES) by a coupling path (COP), it is characterized in that this coupling path (COP) comprises a series resistance (RS).
2. oscillator as claimed in claim 1 (OSC) is characterized in that, this coupling path (COP) comprises a series capacitance (CS).
3. a receiver comprises that signal (Srf) frequency conversion that is used for receiving is the frequency converter (MIX) of intermediate frequency (IF) and the oscillator as claimed in claim 1 (OSC) that mixing carrier wave (Smix) is provided for frequency converter (MIX).
CN98802019A 1997-09-30 1998-08-19 Oscillator Expired - Fee Related CN1113451C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97203021 1997-09-30
EP97203021.7 1997-09-30

Publications (2)

Publication Number Publication Date
CN1244312A true CN1244312A (en) 2000-02-09
CN1113451C CN1113451C (en) 2003-07-02

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CN98802019A Expired - Fee Related CN1113451C (en) 1997-09-30 1998-08-19 Oscillator

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US (1) US6097258A (en)
EP (1) EP0941574B1 (en)
JP (1) JP2001508985A (en)
KR (1) KR20000069168A (en)
CN (1) CN1113451C (en)
DE (1) DE69820586T2 (en)
WO (1) WO1999017438A1 (en)

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Publication number Priority date Publication date Assignee Title
CA2380923C (en) * 1999-08-02 2008-04-01 Qualcomm Incorporated Method and apparatus for multiple band voltage controlled oscillator with noise immunity
DE10137091A1 (en) * 2001-07-30 2003-02-13 Sick Ag Inductive proximity sensor
JP2003124743A (en) * 2001-10-16 2003-04-25 Oki Electric Ind Co Ltd Voltage controlled oscillation circuit
JP4365575B2 (en) * 2002-11-20 2009-11-18 アルプス電気株式会社 Television tuner oscillation circuit
DE102006023353A1 (en) * 2006-05-17 2007-11-22 Atmel Duisburg Gmbh Integrated resonant circuit
DE102007024532B4 (en) * 2006-06-29 2015-10-15 Mediatek Inc. A communication system and method for providing an oscillation signal
US7656235B2 (en) 2006-06-29 2010-02-02 Mediatek Inc. Communication system and oscillation signal provision method
ITMI20090125A1 (en) * 2009-02-03 2010-08-04 Milano Politecnico ELECTRONIC OSCILLATOR WITH REDUCED PHASE NOISE
CN105897296A (en) * 2015-01-26 2016-08-24 泉州市铁通电子设备有限公司 Mine ultra-low-frequency two-way communication equipment
JP6517966B2 (en) * 2018-02-22 2019-05-22 ラピスセミコンダクタ株式会社 Oscillator circuit
US11018625B1 (en) 2020-02-28 2021-05-25 Nxp B.V. Frequency reference generator
US10903790B1 (en) * 2020-05-28 2021-01-26 Nxp B.V. Frequency reference generator

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Publication number Priority date Publication date Assignee Title
US4350971A (en) * 1979-09-13 1982-09-21 Lucas Industries Limited Circuit for use in the detection of the condition of an isolated switch contact
GB2228154B (en) * 1989-02-09 1993-04-21 Plessey Co Plc On-chip integrated oscillator circuits
FR2671242B1 (en) * 1990-12-27 1995-09-01 Thomson Csf VERY LOW PHASE NOISE OSCILLATOR.
BE1007477A3 (en) * 1993-09-06 1995-07-11 Philips Electronics Nv Oscillator.

Also Published As

Publication number Publication date
EP0941574A1 (en) 1999-09-15
DE69820586D1 (en) 2004-01-29
JP2001508985A (en) 2001-07-03
DE69820586T2 (en) 2004-09-16
KR20000069168A (en) 2000-11-25
EP0941574B1 (en) 2003-12-17
CN1113451C (en) 2003-07-02
US6097258A (en) 2000-08-01
WO1999017438A1 (en) 1999-04-08

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